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Using - opertor with hash reference variable

#!/usr/bin/perl use strict; use warnings; my @array = qw( A B C D E ); my %hash = ( A => "AA",              B => "BB",              C => "CC",              D => "DD",              E => "EE" ); my $arrayReference = \@array; my $hashReference = \%hash; sub returnReference {    return \@array; } print ( "\$hashReference->{ duck } = $hashReference->{ duck }\n\n" );